Moosup, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.8 °C (low) to 15.9 °C (high). Annual precipitation averages 1256.3 Millimeters. Moosup is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 2.8 °C | 96.77 mm |
| February | -6.4 °C | 4.2 °C | 85.6 mm |
| March | -2.4 °C | 8.4 °C | 117.6 mm |
| April | 3 °C | 15.3 °C | 113.79 mm |
| May | 8.6 °C | 21.1 °C | 87.63 mm |
| June | 13.7 °C | 25.5 °C | 102.62 mm |
| July | 17.2 °C | 28.4 °C | 91.95 mm |
| August | 16.2 °C | 27.4 °C | 108.97 mm |
| September | 12.1 °C | 23.7 °C | 108.2 mm |
| October | 6.1 °C | 17.3 °C | 123.19 mm |
| November | 0.6 °C | 11.3 °C | 101.09 mm |
| December | -3.9 °C | 5.7 °C | 118.87 mm |
| Annual | 4.8 °C | 15.9 °C | 1256.28 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |